ED1021 - I/O Expander with UART interface

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ED1021 - I/O Expander with UART interfaceED1021 is an I/O expander fully controlled and configured through an UART interface. I/O expanders expand the number of pins available to a host system (typically, a microprocessor). This product includes a low profile 4.000 MHz crystal and pair of 22pF capacitors to easily put you up running.

Highlights

4.5V to 5.5V power supply.

12 GPIOs.

Up to 40mA maximum current in each output except GPIO8 (up to a total device current of 175mA).

Most GPIOs can be an input to a 10bit ADC.

Simple interface to most PC serial ports.

Uses a common 4.000 MHz crystal.

Easy to use UART interface at 38400 bps.

One of a set of 4 GPIO pins can be used as an interrupt request (IRQ) pin.

High stability internal ADC voltage reference for precise readings.

Description
Each pin can be configured either as an input, input with pull-up, input to an internal 8 or 10-bit ADC (10 of the 12 GPIOs), push-pull output or disconnected. When a change happens in a GPIO configured as digital input, ED1021 can automatically send a notification to the host system through the UART interface or an IRQ line. The IRQ line can be configured to be any of the GPIO8-11 pins.

Connection to the PC uses the COMx port. Most PC serial ports and USB-to-Serial converters will tolerate the lower voltage levels provided by ED1021. Some USB-to-Serial converters even use 5V TTL signals, which make them just perfect for interfacing with this I/O expander. The circuit must be powered up before connecting the serial port cable to the PC. (click the schematics for a bigger view)

Resources
Datasheet: Download
Windows PC graphical demo application: DownloadYou can use this application to control an ED1021 connected to a PC through a serial COM port. No installation nor administration rights needed.

Price: 4.00 €

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